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answer c

Step-by-step explanation:

(3x^3-2x^2+4x-5)+(6x-7)

3x^3-2x^2+10x-12

Carl's Triangle has dimensions of Base/opposite = 4 and Height/Adjacent = 3. Diagonal/Hypotenuse = x. Using the Pythagorean theorem X^2 = Base^2 + Height^2.
Thus X = Sqrt√(B^2 + Height^2)
X= √(4^2+3^)
X= √(16+9)
X= ✓(25)
X=5

Perimeter of Triangle = 5+4+3 = 12 inch.